S
M
T
W
T
F
S
29
69°
48°
30
67°
47°
1
68°
48°
2
67°
44°
3
67°
43°
4
65°
42°
5
65°
42°
6
66°
47°
7
66°
44°
8
70°
47°
9
70°
39°
10
67°
39°
11
63°
42°
12
63°
37°
13
62°
36°
14
61°
37°
15
61°
42°
16
60°
38°
17
63°
38°
18
64°
39°
19
63°
40°
20
64°
39°
21
64°
40°
22
65°
42°
23
66°
41°
24
66°
43°
25
68°
47°
26
67°
40°
27
64°
40°
28
64°
41°
29
65°
40°
30
64°
40°
31
65°
41°
1
64°
39°
2
66°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Walnut
Walnut's December 2026 forecast shows daily high temperatures ranging from 60° to 70°, with overnight lows between 36° and 48°. The average high for December is 65° with an average low of 41°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Walnut. See also: January | February | March.
